NOTE: Participants who have been started on INH-containing anti-TB treatment and have received this treatment for less than or equal to 2 weeks, but for whom TB drugs have been discontinued because of resistance to INH (with or without resistance to RIF), can participate in the study, but may need to be hospitalized, at the discretion of the investigator, while these drugs wash out; the minimum washout period for these drugs is 7 days.